| 摘要 |
<p>A "one-component" carbonless copying paper, comprising paper having on the same surface thereof (1) a color former encapsulated in walls of polyurea obtained by the reaction of a polyisocyanate with a polyamine and water, and (2) a developer capable of reacting with the color former to form a dyestuff, the developer having been formed in situ during the reaction of the polyisocyanate with the polyamine.</p> |
